Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e15a18c98790f7f…

MALICIOUS

PDF

69.7 KB Created: 2020-12-22 21:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b1c25f12afefbacd6bb23c74f6eef113 SHA-1: 9972f57c02eb6347edbfcad58c841d2603bce987 SHA-256: 7e15a18c98790f7f23018a4ae6fa948311c64c201e9da6da1b6b45a040350a9e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a link farm for SEO manipulation. No scripts were extracted, and the document body was unreadable, but the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/strik?utm_term=steam+cleaner+carpet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4477163/normal_5fbf04f56e603.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414688/normal_5fcddc73aa973.pdfIn PDF document text
    • https://bitekiparoduj.weebly.com/uploads/1/3/4/0/134017536/3092083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403807/normal_5fad5cead21d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487623/normal_5fcc431f87ac1.pdfIn PDF document text
    • https://xulalotuk.weebly.com/uploads/1/3/4/5/134593582/83316d35c6c4541.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/e78c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_5fa77bac4cbc2.pdfIn PDF document text
    • https://vimexizud.weebly.com/uploads/1/3/4/7/134755563/5663157.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc36d1d405d5340f339be82/t/5fc662ca2dd96f5918c79b67/1606836939086/cell_wars_level_207.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcb81cb919dd0c3e451148/t/5fdd13a31badda75264f7034/1608324004166/19647447602.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc72731eddbb05c6893b1dd/t/5fd65becacac596b0cb95e35/1607883757302/voxubot.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fe011a24a91423ea727098a/t/5fe07e5791828d0f5d77fc01/1608547931581/abrsm_piano_grade_1_pieces.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fe02eeaff074777c986978b/t/5fe10dc9668a647645a6c79d/1608584650768/xurasodutukowelo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd46f08715ea0dc9cdbd2a/t/5fddb24d5809ae3434eb7e9f/1608364622039/citing_mla_format_article_online.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 5004 bytes
SHA-256: 372612d34dae3c6d0a4d0ab4045680daa4381252715f944d9ce2a43c648702a5
font_01_sfnt_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 10152 bytes
SHA-256: 51d760336b0cee63d9b0c884d78f23d4ca54458bb8892195591498a84ea476ff

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